There are many, many ways to QAYG. This is the way I came up w/ to do this quilt w/ wider pieced sashing strips. It is working well for me, but I haven't started the long ones yet. I don't anticipate any problems just will need to be vigilant about keeping true seam allowance.
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Two blocks, a sashing front and back and a batting piece to fit in the sashing space.
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Trim the two edges that you are joining. (I don't trim backs until just before sewing to keep fraying at a minimum)
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You will be pressing a 1/4 inch fold on the edge of your pieced sash, a hot iron and stick glue will be your friend.
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Just one long edge is done this way.
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You will line up the edge of the block w/ the raw edge of the pieced sash (right sides together) and the back sash to the back of the block (right sides together)
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Pin matching seams and points. I am not a big pinner, almost never pin, but here it is a MUST for good results.
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Stitch, a 1/4 inch seam allowance is important so you won't lose points.
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Press your back sash in normal position (leave your front sash as it was sewn for now) I use sizing on the back sash seam as I press it to keep things more steady less likely to shift.
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Now sew the next square to the sashing edge matching raw edges right sides together. (the right side of the new square back and the 1/2 sewn sashing) pin here too, it will make your life easier.
Seems I've reached my pic limit so to be continued.